SLAPO-SYNCPROV(5)

NAME
slapo-syncprov - Syncrepl Provider overlay

SYNOPSIS
ETCDIR/slapd.conf

DESCRIPTION
The Syncrepl Provider overlay implements the provider-side support for syncrepl replication, including persistent search functionality. The overlay can be used with any backend that maintains entryCSN and entryUUID attributes for its entries. It also creates a contextCSN attribute in the root entry of the database. The contextCSN is updated for every write operation performed against the database. To reduce database contention, the contextCSN is only updated in memory. The value is written to the detabase on server shutdown and read into memory on startup, and maintained in memory thereafter. Checkpoints may be configured to write the contextCSN into the underlying database to minimize recovery time after an unclean shutdown. Note that due to deadlock constraints in the LDBM database, this overlay will only work in RefreshOnly mode, and cannot perform checkpoints, on LDBM. On databases that support inequality indexing, it is helpful to set an eq index on the entryCSN attribute when using this overlay.

CONFIGURATION
These slapd.conf options apply to the Syncrepl Provider overlay. They should appear after the overlay directive and before any subsequent database directive.

syncprov-checkpoint <ops> <minutes>
    After a write operation has succeeded, write the contextCSN to the underlying database if <ops> write operations or more than <minutes> time have passed since the last checkpoint. Checkpointing is disabled by default.

syncprov-sessionlog <sid> <size>
    Specify a session log for recording information about entries that have been scoped out of the content identified by <sid>. The number of entries in the log is limited by <size>. Both <sid> and <size> must be non-negative integers, and <sid> can have no more than three decimal digits. When using the session log, it is helpful to set an eq index on the entryUUID attribute in the underlying database.

FILES

ETCDIR/slapd.conf
    default slapd configuration file

SEE ALSO
slapd.conf(5). OpenLDAP Administrator's Guide.